diff --git a/win.uefi.boot.sh b/win.uefi.boot.sh
new file mode 100755
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--- /dev/null
+++ b/win.uefi.boot.sh
@@ -0,0 +1,301 @@
+#!/bin/sh
+#
+# Purpose {{{
+# This script will reboot on Windows system
+#   1. Try to get UEFI entry number for Windows.
+#   2. Define it as default only for next boot.
+#   3. Reboot (default) or poweroff the system.
+# …
+#
+# 2023-08-18
+# }}}
+# Flags {{{
+## Exit on error {{{
+set -o errexit
+## }}}
+## Exit on unset var {{{
+### Use "${VARNAME-}" to test a var that may not have been set
+set -o nounset
+## }}}
+## Pipeline command is treated as failed {{{
+### Not available in POSIX sh − https://github.com/koalaman/shellcheck/wiki/SC3040
+#set -o pipefail
+## }}}
+## Help with debugging {{{
+### Call the script by prefixing it with "TRACE=1 ./script.sh"
+if [ "${TRACE-0}" -eq 1 ]; then set -o xtrace; fi
+## }}}
+# }}}
+# Vars {{{
+PROGNAME=$(basename "${0}"); readonly PROGNAME
+PROGDIR=$(readlink --canonicalize-missing $(dirname "${0}")); readonly PROGDIR
+ARGS="${*}"; readonly ARGS
+readonly NBARGS="${#}"
+[ -z "${DEBUG-}" ] && DEBUG=1
+## Export DEBUG for sub-script
+export DEBUG
+
+## Default values for some vars
+readonly FLAG_REBOOT_DEFAULT="0"
+readonly FLAG_POWEROFF_DEFAULT="1"
+readonly WINDOWS_BASE_LABEL_DEFAULT="Windows"
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+usage() {                                                       # {{{
+
+	cat <<- HELP
+usage: $PROGNAME [-d|-h|-l|-r|-s]
+
+Try to reboot to Windows system.
+
+EXAMPLES :
+    - Reboot to Windows system
+        ${PROGNAME}
+
+    - Define Windows for next boot but poweroff the system
+        ${PROGNAME} --poweroff
+
+    - Search for a specific Windows label
+        ${PROGNAME} --label "Windows Boot Manager"
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
+
+    -l,--label,--windows-label
+        Define a different label to search for Windows UEFI entry.
+        (default: ${WINDOWS_BASE_LABEL_DEFAULT})
+
+    -r,--reboot
+        Reboot the system (default behaviour).
+
+    -s,--shutdown,--poweroff,--halt
+        Ask to shutdown the system.
+
+    -u,--uefi,--uefi-entry
+        Define the UEFI entry to use.
+        (default: first matching from efibootmgr + windows-label)
+
+HELP
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
+
+	unset local_debug_message
+
+	return 0
+}
+# }}}
+error_message() {                                               # {{{
+
+	local_error_message="${1}"
+	local_error_code="${2}"
+
+	## Print message
+	printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}" >&2
+
+	unset local_error_message
+
+	exit "${local_error_code:=66}"
+}
+# }}}
+define_vars() {                                                 # {{{
+	debug_message "-- Define vars BEGIN"
+	# If flag_reboot wasn't defined (argument) {{{
+	if [ -z "${flag_reboot-}" ]; then
+		## Use default value
+		readonly flag_reboot="${FLAG_REBOOT_DEFAULT}"
+	fi
+	# }}}
+	# If flag_poweroff wasn't defined (argument) {{{
+	if [ -z "${flag_poweroff-}" ]; then
+		## Use default value
+		readonly flag_poweroff="${FLAG_POWEROFF_DEFAULT}"
+	fi
+	# }}}
+	# If windows_base_label wasn't defined (argument) {{{
+	if [ -z "${windows_base_label-}" ]; then
+		## Use default value
+		readonly windows_base_label="${WINDOWS_BASE_LABEL_DEFAULT}"
+	fi
+	# }}}
+	# If windows_uefi_entry wasn't defined (argument) {{{
+	if [ -z "${windows_uefi_entry-}" ]; then
+		## Try to get the first matching entry with efibootmgr + windows_base_label
+		debug_message "||define_vars − \
+Try to get Windows UEFI entry with 'efibootmgr' + windows-label (${windows_base_label})."
+		windows_uefi_entry=$(efibootmgr | grep --extended-regexp --max-count=1 -- ".*${windows_base_label}.*" | cut --characters=5-8)
+	fi
+	# }}}
+	# If windows_uefi_entry remains empty {{{
+	if [ -z "${windows_uefi_entry-}" ]; then
+		error_message "windows_uefi_entry seems empty! Verify the windows_base_label used (${windows_base_label}) and your UEFI configuration ('efibootmgr -v')." 11
+	elif [ -n "${windows_uefi_entry}" ]; then
+		debug_message "||define_vars − \
+The ${RED}${windows_uefi_entry}${COLOR_DEBUG} UEFI entry will be used for Windows."
+	else
+		error_message "I am not supposed to happen!" 12
+	fi
+	# }}}
+	debug_message "-- Define vars END"
+}
+# }}}
+
+is_command_available() {                                        # {{{
+
+	local_command_available_cmd="${1}"
+	debug_prefix="${2:-}"
+
+	## Return False by default
+	return_command_available="1"
+
+	if [ "$(command -v ${local_command_available_cmd})" ]; then
+		debug_message "${debug_prefix}is_command_available − \
+${RED}${local_command_available_cmd}${COLOR_DEBUG} seems present on this host."
+		return_command_available="0"
+	else
+		debug_message "${debug_prefix}is_command_available − \
+${RED}${local_command_available_cmd}${COLOR_DEBUG} is not available on this host."
+		return_command_available="1"
+	fi
+
+	unset local_command_available_cmd
+	unset debug_prefix
+
+	return "${return_command_available}"
+}
+# }}}
+
+main() {                                                        # {{{
+
+	debug_message "--- MAIN BEGIN"
+
+	## If a command is missing {{{
+	### Exit with error message
+	is_command_available "efibootmgr" "| " \
+		|| error_message "No test_me command available. Please install efibootmgr package with your package manager." 01
+	## }}}
+
+	## Define all vars
+	define_vars
+
+	## If the expected UEFI entry doesn't exists {{{
+	if ! sudo efibootmgr | grep --quiet -- "Boot${windows_uefi_entry}"; then
+		error_message "The expected UEFI entry (${windows_uefi_entry}) doesn't seem to exist…" 21
+	fi
+	## }}}
+
+	## Define next boot entry
+	sudo efibootmgr --quiet --bootnext "${windows_uefi_entry}"
+
+	## If BootNext entry doesn't match {{{
+	if ! sudo efibootmgr | grep --quiet -- "BootNext: ${windows_uefi_entry}"; then
+		error_message "The expected UEFI entry (${windows_uefi_entry}) doesn't seem to be the next one (see 'sudo efibootmgr' BootNext entry)." 22
+	fi
+	## }}}
+
+	printf '%b' "Reboot/shutdown as requested to winbouse partition\\n"
+	[ "${flag_reboot}" -eq "0" ] && sudo systemctl reboot
+	[ "${flag_poweroff}" -eq "0" ] && sudo systemctl poweroff
+
+	debug_message "--- MAIN END"
+}
+# }}}
+
+# Manage arguments                                                # {{{
+# This code can't be in a function due to argument management
+
+if [ ! "${NBARGS}" -eq "0" ]; then
+
+	manage_arg="0"
+
+	## If the first argument ask for help (h|help|-h|-help|-*h|-*help) {{{
+	if printf -- '%s' "${1-}" | grep --quiet --extended-regexp -- "^-*h(elp)?$"; then
+		usage
+		exit 0
+	fi
+	## }}}
+
+	## If the first argument is not an option
+	if ! printf -- '%s' "${1}" | grep --quiet --extended-regexp -- "^-+";
+	then
+		## Print help message and exit
+		printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+		printf '%b\n' "---"
+		usage
+
+		exit 1
+	fi
+
+	# Parse all options (start with a "-") one by one
+	while printf -- '%s' "${1-}" | grep --quiet --extended-regexp -- "^-+"; do
+
+	case "${1}" in
+		-d|--debug )                          ## debug
+			DEBUG=0
+			debug_message "--- Manage argument BEGIN"
+			;;
+		-h|--help )                           ## help message (if it's not the first option)
+			usage
+			exit 0
+			;;
+		-l|--label|--windows-label )          ## Set windows_base_label var
+			## Move to the next argument
+			shift
+			## Define var
+			readonly windows_base_label="${1}"
+			;;
+		-r|--reboot )                         ## If a reboot was requested (default behaviour)
+			flag_reboot="0"
+			flag_poweroff="1"
+			;;
+		-s|--shutdown|--poweroff|--halt )     ## If a poweroff was requested
+			flag_reboot="1"
+			flag_poweroff="0"
+			;;
+		-u|--uefi|--uefi-entry )              ## Set windows_uefi_entry var
+			## Move to the next argument
+			shift
+			## Define var
+			readonly windows_uefi_entry="${1}"
+			;;
+		* )                                   ## unknow option
+			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+			printf '%b\n' "---"
+			usage
+			exit 1
+			;;
+	esac
+
+	debug_message "| ${RED}${1}${COLOR_DEBUG} option managed."
+
+	## Move to the next argument
+	shift
+	manage_arg=$((manage_arg+1))
+
+	done
+
+	debug_message "| ${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
+else
+	debug_message "| No arguments/options to manage."
+fi
+
+	debug_message "--- Manage argument END"
+# }}}
+
+main
+
+exit 255